Hier nochmal eine Auflistung der Änderungen und Erweiterungen in dieser Version (Danke an Ryan für die Zusammenfassung):

• ActionMailer::Base.server_settings Deprecated
• 1.month.from_now.no_longer.effed
• Source Code Annotations
• A Better Way to Access Your Helpers
• Stop Littering In Your Environment File
• ActiveRecord Caching Provided in Actions
• Cookie Based Sessions are the New Default
• Expanded Caching Scope
• .rhtml and .rxml to Die a Slow and Painful Death
• Mime::Type Convenience Methods
• ActiveRecord Explicit Caching
• RESTful Routes Get a New Custom Delimiter
• Object Transactions Are Out
• ActiveResource Gets Custom Methods
• render Now 70% More Betterer
• A More Flexible to_xml
• New Database Rake Tasks
• validates_numericality_of Gets Pimped
• ActiveResource Finder Update and Custom Headers
• RESTful Routing Updates
• Bringin’ Sexy Back
• No More (conventional) Pagination
• Collection Fixtures
• Use Rake to List Your Routes
• Partials Get Layouts
• Your DB Adapter May Have Left the Building
• Logging Gets a Little Snappier
• Better Cross-Site Request Forging Prevention
• Better Exception Handling
• Specify Plugin Load Ordering
• Validations Now :allow_blank
• Fixtures Just Got a Whole Lot Easier
• Filters get Tweaked
• Pre-Environment Load Hook